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248 lines
8.9 KiB
C++
248 lines
8.9 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./tests/Test_pcg.cc
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#include<bitset>
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#include <Grid/Grid.h>
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using namespace std;
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using namespace Grid;
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using namespace Grid::QCD;
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//Preconditioning: M psi = chi
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// = M P^-1 P psi = chi
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// = M P^-1 psi' = chi
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//Solve for psi' using M P^-1 as operator, then apply P^-1 psi' = psi
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//Inexact preconditioned CG requires slight modification because we want to avoid computing P^-1 exactly
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/////////////////////////////////////////////////////////////
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// Base classes for iterative processes based on operators
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// single input vec, single output vec.
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/////////////////////////////////////////////////////////////
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template<typename T>
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T parse(const std::string &name, std::istream &in){
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std::string p;
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in >> p;
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assert(p==name);
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char eq;
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in >> eq;
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assert(eq == '=');
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T out;
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in >> out;
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return out;
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}
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int main (int argc, char ** argv)
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{
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Grid_init(&argc,&argv);
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int Ls=12;
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RealD mass=0.01;
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RealD outer_tol = 1e-8;
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RealD inner_tol_full = 1e-5;
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RealD inner_tol_half = 1e-5;
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RealD inner_tol_16c = 1e-5;
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RealD inner_tol_8c = 1e-5;
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RealD relup_delta_full = 0.1;
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RealD relup_delta_half = 0.1;
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RealD relup_delta_16c = 0.1;
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RealD relup_delta_8c = 0.1;
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std::string config_file = "";
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RealD lo = 1.0;
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RealD hi = 64.0;
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int order=10;
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for(int i=1;i<argc;i++){
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if(std::string(argv[i]) == "--params"){
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std::ifstream f(argv[i+1]);
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f.exceptions ( std::ifstream::failbit | std::ifstream::badbit );
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Ls = parse<int>("Ls", f);
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#define PARSEIT(NM) NM = parse<RealD>(#NM, f)
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PARSEIT(mass);
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PARSEIT(outer_tol);
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PARSEIT(inner_tol_full);
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PARSEIT(inner_tol_half);
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PARSEIT(inner_tol_16c);
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PARSEIT(inner_tol_8c);
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PARSEIT(relup_delta_full);
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PARSEIT(relup_delta_half);
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PARSEIT(relup_delta_16c);
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PARSEIT(relup_delta_8c);
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#undef PARSEIT
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//f >> outer_tol >> inner_tol_full >> inner_tol_half >> inner_tol_16c >> inner_tol_8c;
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}else if(std::string(argv[i]) == "--config"){
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config_file = argv[i+1];
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}else if(std::string(argv[i]) == "--order"){
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std::string ss(argv[i+1]);
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std::stringstream f(ss);
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f>>order; std::cout << " Order poly set to " <<order<<std::endl;
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}else if(std::string(argv[i]) == "--lo"){
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std::string ss(argv[i+1]);
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std::stringstream f(ss);
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f>>lo; std::cout << " Lo poly set to " <<lo<<std::endl;
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}else if(std::string(argv[i]) == "--hi"){
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std::string ss(argv[i+1]);
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std::stringstream f(ss);
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f>>hi; std::cout << " Hi poly set to " <<hi<<std::endl;
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}
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}
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GridCartesian * UGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplexD::Nsimd()),GridDefaultMpi());
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GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
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GridCartesian * FGrid = SpaceTimeGrid::makeFiveDimGrid(Ls,UGrid);
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GridRedBlackCartesian * FrbGrid = SpaceTimeGrid::makeFiveDimRedBlackGrid(Ls,UGrid);
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GridCartesian * UGrid_f = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplexF::Nsimd()),GridDefaultMpi());
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GridRedBlackCartesian * UrbGrid_f = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid_f);
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GridCartesian * FGrid_f = SpaceTimeGrid::makeFiveDimGrid(Ls,UGrid_f);
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GridRedBlackCartesian * FrbGrid_f = SpaceTimeGrid::makeFiveDimRedBlackGrid(Ls,UGrid_f);
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std::vector<int> seeds4({1,2,3,4});
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std::vector<int> seeds5({5,6,7,8});
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GridParallelRNG RNG5(FGrid); RNG5.SeedFixedIntegers(seeds5);
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GridParallelRNG RNG4(UGrid); RNG4.SeedFixedIntegers(seeds4);
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LatticeFermionD src(FGrid); random(RNG5,src);
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LatticeFermionD result(FGrid); result=zero;
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LatticeGaugeFieldD Umu(UGrid);
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LatticeGaugeFieldF Umu_f(UGrid_f);
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if(config_file.size() > 0){
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FieldMetaData header;
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NerscIO::readConfiguration(Umu,header,config_file);
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}else{
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SU3::HotConfiguration(RNG4,Umu);
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}
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precisionChange(Umu_f,Umu);
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RealD M5=1.8;
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LatticeFermionD src_o(FrbGrid);
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pickCheckerboard(Odd,src_o,src);
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//if(0){ //Test preconditioned CG
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std::cout << "Test preconditioned CG" << std::endl;
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LatticeFermionD result_o(FrbGrid);
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LatticeFermionD result_o_2(FrbGrid);
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result_o.checkerboard = Odd;
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result_o = zero;
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result_o_2.checkerboard = Odd;
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result_o_2 = zero;
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DomainWallFermionD Ddwf(Umu,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5);
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SchurDiagMooeeOperator<DomainWallFermionD,LatticeFermionD> HermOpEO(Ddwf);
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//DoNothingLinearOperator<LatticeFermionD> Prec;
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//FixedIterConjugateGradientPreconditioner<LatticeFermionD> Prec(HermOpEO, 20);
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// SloppyConjugateGradientPreconditioner<LatticeFermionD> Prec(HermOpEO, 1e-2, 1000);
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PolynomialPreconditioner<LatticeFermionD> Prec(HermOpEO,lo,hi,order) ;
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std::cout << "Preconditioned CG" << std::endl;
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InexactPreconditionedConjugateGradient<LatticeFermionD> pCG(Prec,1.0e-8,10000);
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pCG(HermOpEO,src_o,result_o);
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std::cout << "Starting regular CG" << std::endl;
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ConjugateGradient<LatticeFermionD> CG(1.0e-8,10000);
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CG(HermOpEO,src_o,result_o_2);
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LatticeFermionD diff_o(FrbGrid);
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RealD diff = axpy_norm(diff_o, -1.0, result_o, result_o_2);
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std::cout << "pCG HermOp applications " << " Lo " << lo << " Hi " << hi << " Order " << order << " " << pCG.IterationsToComplete << "(outer) + " << Prec.InnerIterations << "(inner) = " << pCG.IterationsToComplete + Prec.InnerIterations << std::endl;
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std::cout << "CG HermOp applications " << CG.IterationsToComplete << std::endl;
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std::cout << "Diff between results: " << diff << std::endl;
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//}
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if(0){ //Test compressor
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LatticeFermionD result_o(FrbGrid);
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LatticeFermionD result_o_2(FrbGrid);
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result_o.checkerboard = Odd;
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result_o = zero;
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result_o_2.checkerboard = Odd;
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result_o_2 = zero;
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DomainWallFermionD Ddwf(Umu,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5);
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SchurDiagMooeeOperator<DomainWallFermionD,LatticeFermionD> HermOpEO(Ddwf);
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DomainWallFermionDF DdwfC(Umu,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5);
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SchurDiagMooeeOperator<DomainWallFermionDF,LatticeFermionD> HermOpEOC(DdwfC);
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std::cout << "Starting regular CG with compressed operator" << std::endl;
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Integer iter1;
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{
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ConjugateGradient<LatticeFermionD> CG(1.0e-8,10000);
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CG.ErrorOnNoConverge = false;
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CG(HermOpEOC,src_o,result_o);
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iter1 = CG.IterationsToComplete;
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}
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Integer iter2;
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{
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std::cout << "Starting regular CG" << std::endl;
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ConjugateGradient<LatticeFermionD> CG(1.0e-8,10000);
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CG(HermOpEO,src_o,result_o_2);
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iter2 = CG.IterationsToComplete;
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}
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LatticeFermionD diff_o(FrbGrid);
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RealD diff = axpy_norm(diff_o, -1.0, result_o, result_o_2);
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std::cout << "CG HermOp CC applications " << iter1 << std::endl;
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std::cout << "CG HermOp applications " << iter2 << std::endl;
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std::cout << "Diff between results: " << diff << std::endl;
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}
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if(1){ //Compare mixed prec restarted single/single internal with same but with single/compressed
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LatticeFermionD result_o_full(FrbGrid);
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LatticeFermionD result_o_half(FrbGrid);
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LatticeFermionD result_o_16(FrbGrid);
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LatticeFermionD result_o_8(FrbGrid);
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result_o_full.checkerboard = Odd;
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result_o_full = zero;
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result_o_16 = result_o_8 = result_o_half = result_o_full;
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//Std
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DomainWallFermionD Ddwf(Umu,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5);
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SchurDiagMooeeOperator<DomainWallFermionD,LatticeFermionD> HermOpEO(Ddwf);
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DomainWallFermionF Ddwf_f(Umu_f,*FGrid_f,*FrbGrid_f,*UGrid_f,*UrbGrid_f,mass,M5);
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SchurDiagMooeeOperator<DomainWallFermionF,LatticeFermionF> HermOpEO_f(Ddwf_f);
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//1/2 prec
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DomainWallFermionFH Ddwfhalf_f(Umu_f,*FGrid_f,*FrbGrid_f,*UGrid_f,*UrbGrid_f,mass,M5);
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SchurDiagMooeeOperator<DomainWallFermionFH,LatticeFermionF> HermOpEOhalf_f(Ddwfhalf_f);
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}
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Grid_finalize();
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}
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